224 MAINE AGR1CULTUR,\L EXPERIMENT STATION. I912. 



distinguish it from any other described species of America. The 

 wing (Fig. 391) is heavily veined and darkly shaded especially 

 near the veins. The head (Fig. 406) is probably better char- 

 acterized by the accompanying illustration than by a description. 

 Me. 1348 Su'b 61 with data "Colo. 1114." 



Pachypsyela. 



It is with reluctance that I name as new species of this group 

 but without a certainty of linking them with the galls described 

 by Riley it is apparently the only thing to do with collection 

 specimens. The figures will characterize these species it is 

 hoped, and later biological data will probably be forthcoming 

 to throw a light on the synonomy. Pachypsylla C. mammae 

 Riley seems to be common in collections. This species has been 

 figured in detail by Stough (1910) so that nothing except a 

 wing (Fig. 401) is given here, for the sake of comparison with 

 the other species. 



Pachypsylla tridcntata n. sp. 



A species easily characterized from other described species by 

 the wings is here described as new. The wings (Fig. 402) 

 have a row of irregular dark spots extending across the veins 

 on distal third of wing. The branches of M and the approxi- 

 mate branch of the Cu are tipped with an angular mark which 

 gives the wing the appearance of being decorated with three 

 tridents. The head (Fig. 415) is characteristic of the genus 

 with rounded lobes and short, stout antennae. The female cauda 

 (Fig. 425) is long and stout and is subequal in length to the 

 four preceding segments. The male cauda (Fig. 437) is pre- 

 ceded by a short constriction. The forceps are shown in Fig. 

 418. Me. 1339 Sub 40 is a single specimen from the Cornell 

 collection and Me. 1348 Sub 67 comprises 4 specimens ^vith data 

 "Colo. 2049, 3-4-96- Canon City, Colo. From galls on Celtis." 



Pachypsylla dubia n. sp. 



Specimens from Celtis galls in the Cornell collection agree 

 with the description of C. gemma so far as the shape of the wing 

 goes, but that species is characterized by Riley as having wings 

 "uniformly immaculate" which precludes the finely but densely 



